Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/ChartInfoServiceImpl.java @ 581:210339fd1a34

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Removed more expensive XPath. flys-client/trunk@2169 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 20 Jun 2011 16:25:48 +0000
parents 460b8e0f0563
children ab8eb2f544f2
rev   line source
535
017371801479 Added a chart info service to fetch the info document for a specific chart from artifact server.
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1 package de.intevation.flys.client.server;
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2
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3 import java.io.InputStream;
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4 import java.io.IOException;
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5 import java.util.ArrayList;
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6 import java.util.List;
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7 import java.util.Map;
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8
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9 import javax.xml.xpath.XPathConstants;
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10
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11 import org.w3c.dom.Document;
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12 import org.w3c.dom.Node;
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13 import org.w3c.dom.NodeList;
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14
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15 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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16
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17 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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18 import de.intevation.artifacts.common.utils.ClientProtocolUtils;
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19 import de.intevation.artifacts.common.utils.XMLUtils;
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20
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21 import de.intevation.artifacts.httpclient.http.HttpClient;
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22 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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23
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24 import de.intevation.flys.client.shared.Transform2D;
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25 import de.intevation.flys.client.shared.exceptions.ServerException;
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26 import de.intevation.flys.client.shared.model.Axis;
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27 import de.intevation.flys.client.shared.model.ChartInfo;
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28 import de.intevation.flys.client.shared.model.Collection;
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29
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30 import de.intevation.flys.client.client.services.ChartInfoService;
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31
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32
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33 /**
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34 * This service fetches a document that contains meta information for a specific
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35 * chart.
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36 *
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37 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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38 */
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39 public class ChartInfoServiceImpl
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40 extends RemoteServiceServlet
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41 implements ChartInfoService
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42 {
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43 public static final String XPATH_TRANSFORM_MATRIX =
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44 "/art:chartinfo/art:transformation-matrix/art:matrix";
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45
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46 public static final String XPATH_X_AXES =
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47 "/art:chartinfo/art:axes/art:domain";
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48
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49 public static final String XPATH_Y_AXES =
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50 "/art:chartinfo/art:axes/art:range";
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51
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52 public static final String EXCEPTION_STRING = "error_chart_info_service";
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53
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54
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55 public ChartInfo getChartInfo(
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56 Collection collection,
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57 String url,
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58 String locale,
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59 String type,
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60 Map<String, String> attr)
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61 throws ServerException
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62 {
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63 System.out.println("ChartInfoServiceImpl.getChartInfo");
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64
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65 Document request = ClientProtocolUtils.newOutCollectionDocument(
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66 collection.identifier(),
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67 type,
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68 type,
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69 ChartServiceHelper.getChartAttributes(attr));
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70
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71 try {
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72 HttpClient client = new HttpClientImpl(url, locale);
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73 InputStream in = client.collectionOut(
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74 request,
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75 collection.identifier(),
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76 type + "_chartinfo");
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77
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78 Document info = XMLUtils.parseDocument(in);
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79
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80 return parseInfoDocument(info);
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81 }
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82 catch (IOException ioe) {
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83 ioe.printStackTrace();
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84 }
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85 catch (Exception e) {
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86 e.printStackTrace();
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87 }
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88
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89 System.err.println("Error while fetching chart info.");
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90
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91 throw new ServerException(EXCEPTION_STRING);
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92 }
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93
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94
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95 protected ChartInfo parseInfoDocument(Document doc) {
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96 Transform2D[] transformer = parseTransformationMatrix(doc);
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97 Axis[] xAxes = parseXAxes(doc);
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98 Axis[] yAxes = parseYAxes(doc);
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99
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100 return new ChartInfo(xAxes, yAxes, transformer);
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101 }
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102
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103
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104 protected Axis[] parseXAxes(Document doc) {
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105 System.out.println("ChartInfoServiceImpl.parseXAxes");
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106
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107 NodeList axes = (NodeList) XMLUtils.xpath(
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108 doc,
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109 XPATH_X_AXES,
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110 XPathConstants.NODESET,
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111 ArtifactNamespaceContext.INSTANCE);
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112
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113 return parseAxes(axes);
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114 }
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115
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116
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117 protected Axis[] parseYAxes(Document doc) {
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118 System.out.println("ChartInfoServiceImpl.parseYAxes");
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119
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120 NodeList axes = (NodeList) XMLUtils.xpath(
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121 doc,
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122 XPATH_Y_AXES,
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123 XPathConstants.NODESET,
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124 ArtifactNamespaceContext.INSTANCE);
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125
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126 return parseAxes(axes);
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127 }
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128
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129
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130 protected Axis[] parseAxes(NodeList axes) {
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131 System.out.println("ChartInfoServiceImpl.parseAxes");
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132
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133 int count = axes != null ? axes.getLength() : 0;
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134
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135 System.out.println("Chart has " + count + " axes.");
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136
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137 if (count == 0) {
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138 return null;
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139 }
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140
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141 Axis[] result = new Axis[count];
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142
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143 for (int i = 0; i < count; i++) {
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144 Node node = axes.item(i);
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145
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146 String posStr = XMLUtils.xpathString(
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147 node, "@art:pos", ArtifactNamespaceContext.INSTANCE);
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148
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149 String fromStr = XMLUtils.xpathString(
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150 node, "@art:from", ArtifactNamespaceContext.INSTANCE);
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151
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152 String toStr = XMLUtils.xpathString(
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153 node, "@art:to", ArtifactNamespaceContext.INSTANCE);
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154
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155 String minStr = XMLUtils.xpathString(
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156 node, "@art:min", ArtifactNamespaceContext.INSTANCE);
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157
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158 String maxStr = XMLUtils.xpathString(
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159 node, "@art:max", ArtifactNamespaceContext.INSTANCE);
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160
552
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161 try {
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162 int pos = Integer.parseInt(posStr);
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163 double from = Double.parseDouble(fromStr);
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164 double to = Double.parseDouble(toStr);
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165 double min = Double.parseDouble(minStr);
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166 double max = Double.parseDouble(maxStr);
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167
556
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168 if (pos >= result.length) {
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169 // this should never happen
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170 System.err.println("The axis is out of valid range: " + pos);
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171 continue;
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172 }
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173
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174 result[pos] = new Axis(pos, from, to, min, max);
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175 }
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176 catch (NumberFormatException nfe) {
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177 nfe.printStackTrace();
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178 }
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179 }
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180
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181 System.out.println("Parsed " + result.length + " axes");
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182
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183 return result;
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184 }
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185
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186
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187 /**
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188 * Parses the chart info document and extract the Transform2D values.
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189 *
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190 * @param doc The chart info document.
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191 *
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192 * @return a Transform2D object to transfrom pixel coordinates into chart
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193 * coordinates.
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194 */
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195 protected Transform2D[] parseTransformationMatrix(Document doc) {
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196 System.out.println("ChartInfoServiceImpl.parseTransformationMatrix");
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197
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198 NodeList matrix = (NodeList) XMLUtils.xpath(
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199 doc,
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200 XPATH_TRANSFORM_MATRIX,
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201 XPathConstants.NODESET,
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202 ArtifactNamespaceContext.INSTANCE);
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203
561
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204 int num = matrix != null ? matrix.getLength() : 0;
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205
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206 List<Transform2D> transformer = new ArrayList<Transform2D>(num);
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207
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208 for (int i = 0; i < num; i++) {
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209 Transform2D t = createTransformer(matrix.item(i));
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210
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211 if (t == null) {
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212 System.err.println("Broken transformation matrix at pos: " + i);
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213 continue;
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214 }
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215
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216 transformer.add(t);
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217 }
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218
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219 return (Transform2D[]) transformer.toArray(new Transform2D[num]);
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220 }
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221
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222
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223 protected Transform2D createTransformer(Node matrix) {
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224 String sx = XMLUtils.xpathString(
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225 matrix, "@art:sx", ArtifactNamespaceContext.INSTANCE);
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226
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227 String sy = XMLUtils.xpathString(
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228 matrix, "@art:sy", ArtifactNamespaceContext.INSTANCE);
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229
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230 String tx = XMLUtils.xpathString(
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231 matrix, "@art:tx", ArtifactNamespaceContext.INSTANCE);
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232
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233 String ty = XMLUtils.xpathString(
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234 matrix, "@art:ty", ArtifactNamespaceContext.INSTANCE);
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235
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236 if (sx != null && sy != null && tx != null && ty != null) {
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237 try {
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238 return new Transform2D(
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239 Double.parseDouble(sx),
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240 Double.parseDouble(sy),
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241 Double.parseDouble(tx),
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242 Double.parseDouble(ty));
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243 }
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244 catch (NumberFormatException nfe) {
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245 System.err.println("Error while parsing matrix values.");
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246 }
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247 }
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248
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249 System.err.println("No matrix values found.");
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250
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251 return new Transform2D(1d, 1d, 0d, 0d);
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252 }
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253 }
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254 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org